Voltage and ohms gives you heat. There is very little way around that. How are the terminals? Signs of corrosion or oxidation?
It is worth taking a wire brush to the terminals and also looking at the crimps on the wires. How are you measuring voltage at the element? Are you reading 220V on the poles of the element itself, or at the wires leading to it?
Just saw that you measured each electrode relative to ground. You have a closed
open neutral in the circuit, hence the dim lamp. I am not familiar enough with Oscar to give you specific helpful insight, but trace your neutral back from the power switch and you'll find an open circuit.
Does the pressurestat switch the hot and the neutral or just one?Edit #2
I found this schematic over on CG:Image: Oscar Schematic originally posted here
Looks to me like you have either a stuck open pressurestat or safety thermostat. Not sure if the safety thermostat can be reset or not. It's worth looking into why it might have tripped if that's the problem.